Eight Pack - 5/8"-18 Cone Lug Nuts Trailer Wheel Lug Nut Set
Set of eight 5/8"-18 fine-thread cone-style lug nuts for trailer wheel applications using a conical tapered seat. Designed for compatible trailer hubs and wheels requiring 5/8" wheel studs and tapered-seat lug nuts.
Key Measurements
| Key Dimension | Measurement |
|---|---|
| Thread Size | 5/8"-18 fine thread |
| Stud Size | 5/8" |
| Hex / Socket Size | 1-1/16" |
| Seat Style | Conical / tapered seat |
Specifications
| Specification | Detail |
|---|---|
| Part Number | 6-109X8 |
| Listing SKU | 6-109X8 |
| Brand | R&P Carriages |
| Product Type | Trailer wheel cone lug nut set |
| Quantity Included | 8 lug nuts |
| Material / Finish | Zinc-plated steel |
| Application | Trailer wheels with matching 5/8"-18 studs and tapered seats |
Key Features
5/8"-18 Fine Thread
Designed for trailer wheel studs with a 5/8" diameter and 18 threads per inch.
Conical Tapered Seat
Cone-seat design fits trailer wheels with matching tapered lug nut seats.
Zinc-Plated Steel
Steel construction with zinc plating for added rust and corrosion resistance in normal trailer use.
8-Pack Lug Nut Set
Includes eight lug nuts for trailer wheel replacement, service, or spare hardware stock.
Fitment / Application
| Category | Details |
|---|---|
| Vehicle / System | Trailer wheel and hub assemblies |
| Primary Fit | Wheels requiring 5/8"-18 conical seat lug nuts |
| Secondary Fit / Common Uses | Heavy-duty trailer axle applications, commonly 8K-12K where specs match |
| Verification Notes | Confirm stud diameter, thread pitch, seat style, socket size, and torque requirement before ordering or installing. |
Included Components
| Quantity | Item |
|---|---|
| 8 | 5/8"-18 cone-style trailer wheel lug nuts |
| Not Included | Wheel studs, wheels, hubs, washers, tools, or additional hardware |
Overview
This listing is for one set of eight 5/8" cone lug nuts for trailer wheel service and replacement. These lug nuts use a 5/8"-18 fine thread, 1-1/16" hex size, and conical tapered seat. The zinc-plated steel finish helps resist rust and corrosion in normal trailer use.
R&P Service Insight
Lug nut fitment depends on the wheel stud, thread pitch, and wheel seat style. Always confirm all three before installation.
- Thread Check: Fits 5/8"-18 fine-thread wheel studs.
- Seat Check: For wheels requiring a cone-style tapered lug nut seat.
- Tool Size: Uses a 1-1/16" hex / socket size.
R&P Knowledge Hub
Compatibility: Designed for trailer wheels using 5/8"-18 wheel studs and conical tapered-seat lug nuts.
Vehicle / System Fit: Commonly used on heavy-duty trailer axle applications, including many 8,000 lb to 12,000 lb axle setups where the wheel and stud specifications match.
Installation Notes: Confirm the stud diameter, thread pitch, wheel seat style, socket size, and torque specification for your axle or wheel before installation.
Performance Insight: Cone lug nuts center the wheel against the matching tapered seat. Correct seating helps provide even clamping force and reduces the risk of wheel movement.
Brand & Fitment Note
Selling Brand: R&P Carriages
Application Reference: Trailer wheel lug nut set for 5/8"-18 studs with conical tapered-seat wheels.
What This Means: This listing includes eight individual lug nuts, enough for one 8-lug trailer wheel position when the matching stud and seat style are required.
Before Ordering: Match the old lug nut and wheel seat style. Do not substitute cone-seat lug nuts on wheels designed for flat, flange, mag, or other seat styles.
R&P Repair Insight
Lug nuts should be inspected whenever wheels are removed, studs are replaced, or axle service is performed. Replace damaged, rounded, cross-threaded, corroded, or mismatched lug nuts before returning the trailer to service.
- Check Threads: Threads should start smoothly by hand and tighten evenly.
- Check Seat Style: The cone seat must match the tapered seat in the wheel.
- Check Torque: Always torque lug nuts to the wheel, hub, or axle manufacturer specification.
